The discovery of Balatonites sp. in the lower part of the Quy Lang Formation in the Lang Nuoc area, Thanh Hoa Province, Central Vietnam establishes that this portion of the formation is of late Middle Anisian age. This ammonoid's cooccurrence with Costatoria goldfussi mansuyi and Trigonodus tonkinensis suggests that this widely distributed bivalve assemblage in Asian shallow marine facies is at least partly of late Middle Anisian age, and its discovery may provide an important key for the establishment of a precise biostratigraphic framework for the Middle Triassic of Asia.
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1 December 2010
Discovery of the Middle Triassic Ammonoid Balatonites in the Quy Lang Formation, Thanh Hoa Province, Central Vietnam
Yasunari Shigeta,
Toshifumi Komatsu,
Nguyen Dinh Huu,
Dang Tran Huyen,
Naoya Iwakiri
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Anisian
Balatonites
Quy Lang Formation
Triassic
Vietnam